netns: ip6mr: allocate mroute6_socket per-namespace.
Preliminary work to make IPv6 multicast forwarding netns-aware.
Make IPv6 multicast forwarding mroute6_socket per-namespace,
moves it into struct netns_ipv6.
At the moment, mroute6_socket is only referenced in init_net.
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/mroute6.h b/include/linux/mroute6.h
index 6f4c180..2cd9901 100644
--- a/include/linux/mroute6.h
+++ b/include/linux/mroute6.h
@@ -117,6 +117,7 @@
#include <linux/pim.h>
#include <linux/skbuff.h> /* for struct sk_buff_head */
+#include <net/net_namespace.h>
#ifdef CONFIG_IPV6_MROUTE
static inline int ip6_mroute_opt(int opt)
@@ -232,10 +233,13 @@
extern int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait);
#ifdef CONFIG_IPV6_MROUTE
-extern struct sock *mroute6_socket;
+static inline struct sock *mroute6_socket(struct net *net)
+{
+ return net->ipv6.mroute6_sk;
+}
extern int ip6mr_sk_done(struct sock *sk);
#else
-#define mroute6_socket NULL
+static inline struct sock *mroute6_socket(struct net *net) { return NULL; }
static inline int ip6mr_sk_done(struct sock *sk) { return 0; }
#endif
#endif
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 2932721..8a0a67d 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -55,5 +55,8 @@
struct sock *ndisc_sk;
struct sock *tcp_sk;
struct sock *igmp_sk;
+#ifdef CONFIG_IPV6_MROUTE
+ struct sock *mroute6_sk;
+#endif
};
#endif
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 7d92fd9..4b15938 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -137,7 +137,8 @@
struct inet6_dev *idev = ip6_dst_idev(skb->dst);
if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) &&
- ((mroute6_socket && !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
+ ((mroute6_socket(dev_net(dev)) &&
+ !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
&ipv6_hdr(skb)->saddr))) {
struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index d1008e6..02163db 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -49,9 +49,6 @@
#include <net/addrconf.h>
#include <linux/netfilter_ipv6.h>
-struct sock *mroute6_socket;
-
-
/* Big lock, protecting vif table, mrt cache and mroute socket state.
Note that the changes are semaphored via rtnl_lock.
*/
@@ -820,7 +817,7 @@
skb_pull(skb, sizeof(struct ipv6hdr));
}
- if (mroute6_socket == NULL) {
+ if (init_net.ipv6.mroute6_sk == NULL) {
kfree_skb(skb);
return -EINVAL;
}
@@ -828,7 +825,8 @@
/*
* Deliver to user space multicast routing algorithms
*/
- if ((ret = sock_queue_rcv_skb(mroute6_socket, skb)) < 0) {
+ ret = sock_queue_rcv_skb(init_net.ipv6.mroute6_sk, skb);
+ if (ret < 0) {
if (net_ratelimit())
printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n");
kfree_skb(skb);
@@ -1145,8 +1143,8 @@
rtnl_lock();
write_lock_bh(&mrt_lock);
- if (likely(mroute6_socket == NULL))
- mroute6_socket = sk;
+ if (likely(init_net.ipv6.mroute6_sk == NULL))
+ init_net.ipv6.mroute6_sk = sk;
else
err = -EADDRINUSE;
write_unlock_bh(&mrt_lock);
@@ -1161,9 +1159,9 @@
int err = 0;
rtnl_lock();
- if (sk == mroute6_socket) {
+ if (sk == init_net.ipv6.mroute6_sk) {
write_lock_bh(&mrt_lock);
- mroute6_socket = NULL;
+ init_net.ipv6.mroute6_sk = NULL;
write_unlock_bh(&mrt_lock);
mroute_clean_tables(sk);
@@ -1189,7 +1187,7 @@
mifi_t mifi;
if (optname != MRT6_INIT) {
- if (sk != mroute6_socket && !capable(CAP_NET_ADMIN))
+ if (sk != init_net.ipv6.mroute6_sk && !capable(CAP_NET_ADMIN))
return -EACCES;
}
@@ -1214,7 +1212,7 @@
if (vif.mif6c_mifi >= MAXMIFS)
return -ENFILE;
rtnl_lock();
- ret = mif6_add(&vif, sk == mroute6_socket);
+ ret = mif6_add(&vif, sk == init_net.ipv6.mroute6_sk);
rtnl_unlock();
return ret;
@@ -1242,7 +1240,7 @@
if (optname == MRT6_DEL_MFC)
ret = ip6mr_mfc_delete(&mfc);
else
- ret = ip6mr_mfc_add(&mfc, sk == mroute6_socket);
+ ret = ip6mr_mfc_add(&mfc, sk == init_net.ipv6.mroute6_sk);
rtnl_unlock();
return ret;